[shereez234]

Dear fellow CFD users!

I would be grateful if people can suggest me good suggestions for ICEM mesh quality ( and I mean Hexa unstructured blocked mesh).

I have been doing a mesh of about 9 million elements. After a lot of input I am able to achieve a quality of 0.3 and min angle above 18. Skewness is above 0.2.

However when I take it to fluent it gives me orthogonal quality of 0.0003 which is too low. Why does fluent show low quality for the mesh?

And also I found out that the no of cells in ICEM was about 9.3 million and in fluent it got reduced to 8.8 million approximately. why does this happen?

Can people who use CFD ( specially fluent and ICEM) give suggestions on their best practices with respect to mesh quality improvement, rule of thumb, guide lines. Please input your ideas.

Cheers!
Shereez

[shereez234]

Any one want to share their experience and views on acceptable quality and most important criterion? I recently read that CFX is less sensitive to mesh quality than fluent.

[shereez234]

Also when you have two wings and a fuselage in aircraft as wing body and you know Sref ( reference area is 100m2 approx for half model) do you put 200 m2 for full model even if you wanted to calculate lift per zone? ( per wing) or do you put 100m2 still?

I know this question is not related to meshing but still..! sorry about that

[shereez234]

Nevermind about this thread now! Found the quality criterion that is good enough

[attiquejavaid08]

Originally Posted by shereez234

Dear fellow CFD users!

Hexa unstructured blocked mesh
mesh of about 9 million elements. quality of 0.3
min angle above 18
Skewness is above 0.2.

fluent gives orthogonal quality of 0.0003

Which skewness? I see in ICEM after conversion to unstruc, 'equianlge skewness' and 'skew'. both are different. when imported to Fluent, it shows third type in quality check.

share your feedback, which to check?

How did you solve this issue? did you go ahead with this orthogonal quality?

what's criteria you found?

share please.

regards,
AJ

[shereez234]

Originally Posted by attiquejavaid08

Which skewness? I see in ICEM after conversion to unstruc, 'equianlge skewness' and 'skew'. both are different. when imported to Fluent, it shows third type in quality check.

share your feedback, which to check?

How did you solve this issue? did you go ahead with this orthogonal quality?

what's criteria you found?

share please.

regards,
AJ

Hey man sorry for the late reply:

http://www.cfd-online.com/Forums/ans...eria-icem.html

Check 4th post in the above Link. I can tell you that Tgrid Skew is the equivalent of Fluent's skew (squish) atleast I believe.

But refer to that post for the rule of thumb

Regards

Shereez